different between effulgence vs intensity

English

From Latin ex- (“out of, from”) and fulgere (“to shine”).

effulgence (countable and uncountable, plural effulgences)

A state of being bright and radiant, splendor, brilliance.
- 1875, Henry James, Roderick Hudson, New York Edition 1909, hardcover, page 457
  He stood for a moment taking in the effulgence.

intense +? -ity. Cf. also Medieval Latin intensitas.

intensity (plural intensities)

The quality of being intense.
The degree of strength.
(physics) Time-averaged energy flux (the ratio of average power to the area through which the power "flows"); irradiance.
(optics) Can mean any of radiant intensity, luminous intensity or irradiance.
(astronomy) Synonym of radiance.
(geology) The severity of an earthquake in terms of its effects on the earth's surface, and buildings. The value depends on the distance from the epicentre, and is not to be confused with the magnitude.

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